The attachment in comment #10 confirms the problem is happening at a low
level in the kernel. Although Xorg could override that if it was smart
enough. In theory you can do it manually but would need to become an
expert at crafting modeline entries to get it working. I don't know how
myself. If that's possible then the data you need is in comment #7.
Obviously Windows 10 demonstrates that it is possible to support this
monitor with this HDMI port. Only Linux does not yet...
As a workaround, if you have a USB-C port and an appropriate
cable/adapter then you might be able to use the DisplayPort on the
monitor. If that works then it should give different timings and might
provide the 4K option... also at 60Hz instead of just 30Hz.
** Changed in: linux (Ubuntu)
Status: Incomplete => New
** Changed in: xorg-server (Ubuntu)
Status: Incomplete => New
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https://bugs.launchpad.net/bugs/1890418
Title:
i915 does not expose vendor-specific extended HDMI timings/modes
Status in linux package in Ubuntu:
Incomplete
Status in xorg-server package in Ubuntu:
New
Bug description:
I have a Toshiba radius 11 laptop which has a 4 k native screen. I
have connected an Asus PB287Q 28" external monitor
(https://www.asus.com/us/Commercial-Monitors/PB287Q/specifications/)
over HDMI which displays the full 4K resolution when running under
windows10 but will only reach a maximum resolution of 1920x1080 under
ubuntu 20.04, same hardware just dual booting. Under Monitor
Preferences this monitor is detected as an "Ancor Communications inc
28" and the monitor preferences provides a number of resolution steps
up to 1920. If I issue "xrandr --addmode HDMI-1 3840x2160" this
resolution is added to the monitor preferences pick list but
attempting to apply it results in "the selected configuration for
displays could not ..." message
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